97 grandam 3.1 idles rough in park

I have a 97 grandam 3.1 The engine idles rough but runs fine when you give it the gas. It shows no codes. Do any of you fine folks have any idea why this is happening ? Thanks

Any Ideas anyone

When is the last time the plug wires and plugs were replaced? The coil towers get corroded also. You can clean the IAC and the MAF and can also check for any vacuum leaks. Clean the throttle body also...

When is the last time the plug wires and plugs were replaced? The coil towers get corroded also. You can clean the IAC and the MAF and can also check for any vacuum leaks. Clean the throttle body also...

Thanks gmtech1 for reply what is the MAF and how do you clean it Thanks again

MAF = Mass Air Flow. It's located in the air inlet tube between the air filter housing and the throttle body. Can be cleaned with specific MAF cleaner (from a parts store). Take it off and spray the two electrodes wired in the center of it. The get crap built up on them.

MAF = Mass Air Flow. It's located in the air inlet tube between the air filter housing and the throttle body. Can be cleaned with specific MAF cleaner (from a parts store). Take it off and spray the two electrodes wired in the center of it. The get crap built up on them.

Thanks again for the info have a great day my friend

Found problem vacuum leak at fuel regulator